I'm sorry but there absolutely no reason why transmog is wrong / disadvantage / should be removed.
Its an optional feature that doesn't give anyone any sort of advantage, - some people will argue in pvp, people using high end pvp gear but appearing to be a fresh level 100 in shit gear. I only have one thing to say, serves you right for specifically picking out easy targets for easy kills.
Judging someone if they are good or not based on appearance is terrible, lets say we remove x mog, there will still be people who are in heroic / mythic gear who get carried, run in places by friends, pay for third party company to raid for them etc. Counter side to this, if you see someone x mogged in full T3 or corrupted ashbringer wanting in on your raid, in my opinion, thats a pretty safe bet, that, that person is decent (regardless BMAH). Furthermore, you could just not be lazy and check the amoury for their history, like we did inMoving on, You say we can equip the gear we like to walk around in, yes we could, but if you remember those good old days, we used to carry mounts, different amour, pets, junk, quest gear, potions, foods, and you were lucky if you had 4 nether weave bags. Granted now we have huge bags, and items each expansion are getting less and less to carry (slot wise) but I don't want to carry a set of amour that I want to sit in while Im not raiding.good old days of wow
Anyways to actually say why I do transmog - its the only thing I enjoy in game now, kind of. I'm grinding down gold and legenderies in game through older raids. If your like me and run DS, FL, BOT, Kara, BT, SoO (the usuals) a few times each week, it really gets boring, really quickly, especially when you get what you want (for example I now have both glaives on my dk, its killed my motivation to do it on my monk). But if I look at my x mog list and I have items I want in each of these places, its not to bad. Lets take BT for example, I want the glaives on my monk yes, but I also now want the VoS and the white staff. The thought of the place having more than one item for me actually makes me want to keep going